Why is my laptop fan running constantly?

Check your power settings and make sure the laptop is not set to ‘high performance’ mode
Check if there are any applications running in the background that may be consuming extra processor power
Check if there are any applications with processor-stressing graphics that could be running
Check for dust build-up in the laptop’s fan vents and open the laptop to manually clean out any buildup
Update the laptop’s hardware drivers to the latest versions
Have a technician review the laptop’s hardware and replace any faulty parts